[AusNOG] Reference clock for SDH network
doconnor at gsoft.com.au
Tue Oct 27 14:07:55 EST 2009
On Tue, 27 Oct 2009, Damien Gardner Jnr wrote:
> On 27/10/2009, at 12:19 PM, Tom Storey wrote:
> > Hi All,
> > Can anyone suggest a clock that is able to produce a 2mbit/2mhz
> > sync signal to use as a reference for an SDH network?
> > The network is detatched from any existing SDH networks, so I have
> > to clock it from scratch.
> > So far I have only come across one that is around the $3k mark
> > (Oscilloquartz), and my googlefu is failing me at the moment.
> I'm obviously missing something here, but how on earth can a crystal,
> a couple of caps and resistors, and maybe a transistor or two or an
> IC work out to the $3k mark??
> I'm assuming you're actually looking for something more complex than
> a simple 2mhz clock signal??
Depends what level of jitter and stability you need.
A rubidium conditioned signal source could easily cost that much.
If the jitter and stability aren't a big issue then a $5 XTAL from
Jaycar will do though ;)
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
-- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
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